Propeller-wheel.



No. 847,961. PATEN'TED MAR. 19, 1907.

J. DE LA MAR.

PROPELLER WHEEL.

APPLICATION FILED JUNE 18. 1906 Z026 e Q69. Inventor.- J Jobeph oleZaWLm,

UNITED STATES PATENT OFFICE JOSEPH DE LA MAR, or NEW YORK, N. Y,

PROPELLER-WHEEL.

1'0 will whom, it may concern:

Be it known that I, J osnrn DE LA MAR, a citizen of the United States,residing at New York, in the county of New York and State ofNew York,have invented certain new and useful Improvements in Propeller-Wheels,of which the following is a specification.

My invention pertains to propeller-wheels and it has particularreference to what is known as spiral propellers, in Which a plurality ofblades is disposed along the shaft. MgMy object is to provide apropeller which, in its rotary motion will oifer' as little resistanceas possible at the core of the wheel, and to this end I have devised aspirally- -formed rib, the opposite ends of which are rigidly secured tothe shaft, and which has thereon removable blades within and without therib whereby an effective action is roducecll by the same, as will now beset fort in detai In the drawings, Figure 1 is a side elevation of myimproved form of propeller-wheel,

and Fig. 2 is a rear end view of the same.

In constructing my invention I provide a' propeller-shaft 3, on which Ilace two fixed collars 4 5, to the forward col ar 4 of which I attachone end of a spirally-formed rib 6 and to the rear collar is attachedthe rear end of the rib. This attachment may be made by means of screws7 or otherwise, and these collars are keyed (not shown) or otherwiserigidly secured to the shaft. Exteriorly on this rib and at suitableintervals I place blades 8. These may be secured by bolts 9' caused bythe collars to which the ends of the ribs are attached.-

Interiorly blades 12 are placed on the rib equal in'number to theexterior blades, or a greater or less number, as may be considered mosteffective, and these may be located without reference to the location ofthe outer blades. In this case, however, I show the interiorbladesattached by the same bolts as are employed to secure the outerblades and Specification of Letters Patent.

Patented March 19, 1;07.

they are also disposed at the same pitch. In practice the inner bladesshould have a greater pitch than the outer blades, as will be obvious tothe engineer.

By reference to Letters Patent No. 823,476, issued to me on the 12th dayof June, 1906, it will be seen that the spirally-formed rib has one ofits ends secured to a tubular shaft and its other end to an inner shaftand that the exterior blades are attached to the rib, while the interiorblades are attached to the inner shaft and the two sets of bladesrevolve in the opposite direction. Such construction, however,necessitates gearing which I dispense with in the present invention. Inthe present invention it will be obvious that I have simplified theconstruction, inasmuch as I attach both ends of the spiral rib to asingle shaft and have both the inner and the outer blades attached ,to arib, which therefore frees the shaft of any collars or other necessaryobstructions necessary to attach blades thereto and greatly cheapens theconstruction.

What I claim as new is 1. A propeller-wheel, comprising a shaft having"thereon a spirally-formed rib, both having blades thereon. I

2. A propeller-wheel, comprising a shaft having thereon aspirally-formed rib, both ends of which are rigidly secured thereto, andhaving a pluralityof exterior blades thereon.

3. A propeller-wheel, comprising a shaft having thereon aspirally-formed rib, both ends of which are rigldly secured thereto, andhavin a plurality of interior blades thereon. a 4. i propeller-wheel,comprising a shaft having thereon a spirally-formed rib, both ends ofwhich are rigidly secured thereto, and having a plurality of exteriorand interior blades.

5. A propeller-wheel, comprising a shaft having thereon aspirally-formed rib, both ends of which are rigidly secured thereto, andhaving blades thereon adapted to be adjusted at any desired pitch.

6. A propeller-wheel, comprising a shaft having thereon aspirally-formed rib, with its opposite ends rigidly secured theretohaving exterior blades and interior blades attached thereto, one set ofblades being adapted to be adjusted at a different pitch from the otherset;

' 7. A propeller-wheel, comprising a shaft ends of which are rigidlysecured thereto, and

5 from said rib, and attached thereto.

having thereon, and rigidly secured thereto,

the ends of a spirally-formed "ib, a plurality the same generaldirection to the rib.

of blades projecting outwardly from said rib, Signed at New York, in thecounty of New and a plurality of blades projecting inwardly York andState of New York, this 12th day l of June, A. D. 1906.

said inner and outer blades being disposed in 16 8. A propeller-wheel,comprising a shaft JOSEPH DE LA MAR. having thereon, and rigidly securedthereto, Witnesses: the ends of'a spirally-formed rib, a plurality L J.NICHOLS, of inner and outer blades secured to said rib,

N. C. DONATO.

